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Proceedings Paper

Thermal conductivity studies of CdZnTe with varying Te excess
Author(s): Maxx Jackson; Brittany Bennett; Dustin Giltnane; Stephen Babalola; Martin F. Ohmes; A. C. Stowe
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Paper Abstract

Cadmium Zine Telluride (CZT) has been extensively studied as a room temperature semiconductor gamma radiation detector. CZT continues to show promise as a bulk and pixelated gamma spectrometer with less than one percent energy resolution; however the fabrication costs are high. Improved yields of high quality, large CZT spectroscopy grade crystals must be achieved. CZT is grown by the Traveling Heater Method (THM) with a Te overpressure to account for vaporization losses. This procedure creates Te rich zones. During growth, boules will often cleave limiting the number of harvestable crystals. As a result, crystal growth parameter optimization was evaluated by modeling the heat flow within the system. Interestingly, Cadmium Telluride (CdTe) is used as a thermal conductivity surrogate in the absence of a thorough study of the CZT thermal properties. The current study has measured the thermal conductivity of CZT pressed powders with varying Te concentrations from 50-100% over 25-800°C to understand the variation in this parameter from CdTe. Cd0.9Zn0.1Te1.0 is the base CZT (designated 50%). CZT exhibits a thermal conductivity of nearly 1 W/mK, an order of magnitude greater than CdTe. Further, the thermal conductivity decreased with increasing Te concentration.

Paper Details

Date Published: 30 September 2016
PDF: 8 pages
Proc. SPIE 9968, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVIII, 99681E (30 September 2016); doi: 10.1117/12.2237822
Show Author Affiliations
Maxx Jackson, Y-12 National Security Complex (United States)
Alabama A&M Univ. (United States)
Brittany Bennett, Y-12 National Security Complex (United States)
The Univ. of Tennessee (United States)
Dustin Giltnane, Y-12 National Security Complex (United States)
The Univ. of Tennessee (United States)
Stephen Babalola, Alabama A&M Univ. (United States)
Martin F. Ohmes, FLIR Detection, Inc. (United States)
A. C. Stowe, Y-12 National Security Complex (United States)
The Univ. of Tennessee (United States)
Alabama A&M Univ. (United States)


Published in SPIE Proceedings Vol. 9968:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVIII
Ralph B. James; Michael Fiederle; Arnold Burger; Larry Franks, Editor(s)

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